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About 95% of all checked luggage on domestic flights weigh between what two values? How did you find this?
Assume that the mean reading is 0 degree Celsius and the standard deviation of the readings is 1.00 degree Celsius Also assume that the frequency distribution of errors closely resembles the normal
You just purchase a dinner and found that there is no napkin in your bag, what is the probability that Jan has prepared your order?
Dr. Zak also gave his students the Beck Depression Inventory (BDI). The correlation between his test and the BDI was r =.14. Evaluate this correlation. What does this correlation tell us about the r
Final averages are typically approximately normally distributed with a mean of 70 and a standard deviation of 10.5. Your professor says that the top 9% of the class will receive an A; the next 20%,
What is the average of sticks of gun he or she chewing daily was 8. To test the claim a researcher selected a random sample of 36 gum chewer and found the mean number of sticks of gum chewed per da
The time it takes a worker on an assembly line to complete a task is exponentially distributed with a mean of 8 minutes. What is the probability that it will take a worker less than 4 minutes to com
The mean time a customer spends on line per day is about 28 minutes. You are asked to test his claim. How would you write the null hypothesis if you represent the internet provider and want to suppo
A group of 100 nursing students took a statistics exam. The mean score was 80 and the standard deviation was 5? Assuming that the sample was not skewed (i.e. it was normally distributed), about how
A newspaper publisher mails out a survey 6 months before a subscription expires. This survey asks its subscribers if they are going to renew. On average, 8% of the subscribers respond to the survey.
A tank of fuel allows an airplane to travel 700 miles. The standard deviation is 40 miles. What is the probability a plane can travel 770 miles on one tank of fuel?
Why might the assumption of independence be violated? (d) Why might a driver be tempted not to use a seat belt "just on this trip"?
Choose and compute the appropriate descriptive statistics to describe characteristics of the sample under study (such as sex distribution, age, and ethnicity) and the anxiety reported by the sample
Two colored dice are tossed. What is the probability that the sum of the numbers shown on the upper faces is equal to 7?
there are 12 lenghts of randomly selceted movies they are as follow: 110, 96, 125, 94, 132, 120, 136, 154, 149, 94, 119, 132. the question is construct a 99% confidence interval estimate of the mean
Suppose that a random sample of 100 public manager-controlled companies in New Zealand is found to give a mean audit delay of = 93 days, and assume that σ equals 37 days. Calculate the lower
Determine whether a normal distribution or a t-distribution should be used or whether neither of these can be used to construct a confidence interval.
the mean time to repair aswitch as found from a sample of size 20 is 10.5 min the sd of repair time is 1.5 min find two sided 95% confidence interval for mean repair time and interprete it.
She randomly selects 100 students from the 260 business majors and 100 students from the 180 political science majors. Does this sampling plan result in a random sample? Simple random sample? Explai
Starting with a hypothetical population of 14,000 people and an even age distribution (1,000 in each age group from 1-5 to 66-70 years), assume that the population initially has a total fertility ra
A random smaple of 75 students has a test score average with a standard deviation of 9.5. Find the margin of error if c=0.95
How many questions must the test contain in order to reduce the standard deviation of the student's proportion of correct answers to half its value for a 100-item test.
The time between surface finish problems in a galvanizing process is exponentially distributed with a mean of 40 hours. A single plant operates three galvanizing lines that are assumed to operate i
Among the respondents who are opposed to the bill, what is the relative frequency of Democrats?
She gathers a sample of 35 subjects with depression and obtains a sample mean of 7.82 micrograms/100 ml. What are the null and alternative hypotheses for this study?